1. Department of Neurology, Mayo Clinic , Jacksonville, FL 32224 , USA
2. Division of Neurological and Psychiatric Nursing, Faculty of Health Sciences, Medical University of Gdansk , 80-211 Gdansk , Poland
3. Neurology Department, St Adalbert Hospital, Copernicus PL Ltd. , 80-462 Gdansk , Poland
4. Department of Neuroscience, Mayo Clinic , Jacksonville, FL 32224 , USA